June 2023 Chemistry Regents #36-40
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Questions |
Answer | Links |
Explanations |
| 36 Which formula represents calcium hydride? 1. CaH 2. CaH2 3. CaOH 4. Ca(OH)2 |
2 | trickier question. not hydroxide so 3 and 4 are out Ca is 2+ and Hydride H is 1- so CaH2 |
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| 37 What is the number of moles in a 78.8-gram sample
of MgCO3 (gram-formula mass = 84.3 g/mol)? 1. 0.949 mol 2. 0.935 mol 3. 0.843 mol 4. 1.070 mol |
2 | equations are on Table T 78.8g /84.3g/mol= 0.935 mol |
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| 38 Given the equation representing a reaction: F2(g) + 2 KCl(aq) --> 2 KF(aq) + Cl2(g) Which type of chemical reaction is represented by the equation? 1. synthesis 2. decomposition 3. single replacement 4. double replacement |
3 | element + compound --> compound + element | |
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| 39 based on Table H, which compound has the strongest
intermolecular forces at 60 kPa? 1. ethanoic acid 2. ethanol 3. propanone 4. water |
1 | strongest forces will require the highest temperature to create 60kPa of pressure | |
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1 | Xenon is a Noble gas even at STP it is a
monoatomic gas. Pick to picture with it separated and not
paired up. 1. is a monoatomic gas 3. is a diatomic gas 2,4 not gases
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